Heists & Mysteries · Series

Unsolved

Katy & Theo·1 episode

Vanishings, ciphers and cold cases. Katy lays out the evidence and the best theories, and lets you decide.

Episodes

1. 2The Zodiac Killer's Second Cipher SolvedThe Zodiac's second cipher beat the FBI for half a century. Then three strangers cracked it.September 30, 2026·6 min